While the data is encrypted between RIM’s servers and the BlackBerrys, it has to be encrypted by RIM — so RIM has access to the plaintext.

This is similar to how Opera Mini handles encryption: although everything coming to and from Opera servers is encrypted, the servers themselves need see what’s going on to do its magic.

Note that I don’t think BlackBerry has a security issue. But by making a statement that seems technically inaccurate they’re setting themselves up for scrutiny from the users that should be supporting them right now.